The Mad Hatter from Lewis Carroll’s “Allice in Wonderland” is eccentric, to say the least. The character’s name came from the saying “mad as a hatter.” Making hats used to involve the use of mercury, which was highly toxic. A hat maker suffering from mercury poisoning would often exhibit strange and anti-social behavior.
The Mad Hatter that Alice meets has a slip of paper on the side of his hat that reads “In this style 10/6.” “10/6” is a price of ten shillings sixpence. The slip of paper is either an order for a hat the Mad Hatter is supposed to make for ten shillings sixpence, or is an advertisement offering to make a hat “in this style” for that price. In the Disney animated version of the story, the slip of paper reads simply “10/6.”
In March 2012, the television series “Once Upon a Time” featured a mad hatter named Jefferson in the episode “Hat Trick.” The series is heavily steeped in classic fairytale characters.